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Finding the Fourth Proportional to 712.32, 1,066.80 and 678.84

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Solution

The fourth proportional to 712.32, 1,066.80 and 678.84 is: 1,016.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.32 : 1,066.80 = 678.84 : x
  2. Step 2: Convert to fraction form
    712.32/1,066.80 = 678.84/x
  3. Step 3: Cross multiply
    712.32x = 1,066.80 × 678.84
  4. Step 4: Simplify right side
    712.32x = 724,186.51
  5. Step 5: Solve for x
    x = 724,186.51/712.32
  6. Step 6: Final answer
    x = 1,016.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.